Mathematics
posted by Crystal
I have the polynomial x^2+2x8 and when I tried to factor it, I just ended up confusing myself. Can anyone please help make sense of this?

Reiny
Can you think of two numbers which when multiplied give you 8 (the last number) and when added will give you +2 (the coefficient of the middle term) ?
How about 4 and 2, so .... (4)(2 = 8 , 4 + (2) = +2
x^2 + 2x  8
= (x+4)(x2)
If the coefficient of the square term is 1, like in x^2, follow the above method.
If there are factors, it will work.
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